CVE-2026-16103
EUVD-2026-4522517.07.2026, 17:17
A flaw was found in the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication (CIBA) initiation handler but were omitted from the token redemption handler. This allows an attacker with valid client credentials to obtain access and refresh tokens for a user account that has been locked due to brute-force protection, provided the authentication request was started before the lockout occurred and was approved by the user.Enginsight
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| redhat | build_of_keycloak | - |
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= Vulnerable software versions
Common Weakness Enumeration
- CWE-305 - Authentication Bypass by Primary WeaknessThe authentication algorithm is sound, but the implemented mechanism can be bypassed as the result of a separate weakness that is primary to the authentication error.
- CWE-841 - Improper Enforcement of Behavioral WorkflowThe software supports a session in which more than one behavior must be performed by an actor, but it does not properly ensure that the actor performs the behaviors in the required sequence.
Vulnerability Media Exposure